Refactor MTE-2770 Remove references for RequestDesktopTest

[clarmso]

📜 Tickets

Jira ticket

💡 Description

RequestDesktopTest has been moved to BrowsingTest via MTE-2598. Let me remove all references to RequestDesktopTest from the code base.

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed, I updated documentation / comments for complex code and public methods
• If needed, added a backport comment (example @Mergifyio backport release/v120)